Chromium compound.



WILLIAM BROKERS AND ISAAC DREYFUS, OF BROOKLYN, NEW YORK, ASSIGNORS TOW. BECKERS ANILINE AND CHEMICAL WORKS, 0F BROOKLYN, NEW YORK.

CHROMIUM COMPOUND.

No Drawing.

To all whom it may concern:

Be 1t known that we, YVILLIAM BEoKnas and Isaac Duurrus, both citizensof the United States, and residents of the borough of Brooklyn, in thecounty of Kings, city and State of New York, have invented certain newand useful Improvements in Chromium Compounds, of which the following isa specification.

The object of our invention is a method for the production of new, noveland useful chromium compounds the aqueous solutions of which are notprecipitatable by means of alkalis or mordant colors and for theproducts produced thereby. Whereas, chromium compounds may be easilyprecipitated from their aqueous solutions by means of alkalis or mordantcolors, we have found that it is possibleto produce a chromium compoundunder such circumstances and conditions that the chromium compoundcontained therein is not precipitated froin its aqueous solution by thealkalis or mordant colors. The Solutions thus produced remain perfectlyclear and unprecipitated even when boiled with alkali hydrates or withthe mordant colors and possess mordanting properties in dyeing: of greatconunercial value.

if a solution of a neutral chromate compound of an alkali-metal be addedto glurose and heated until no chromic acid canbe detected by means ofan acidulate-d potassium. iodid solution, theresulting product is asolution of a chromium compound in such physical and chemical conditionthat no precipitate formed upon the addition of alkalis such sodium.carbonate, potassium carbonate, sodiur hydrate, potassium hydrate, etc,or upon the addition of mordant colors such alizarin, lor wood, etc.While the exact composition these solutions has not been definitelydetermined, it would seem that the chromium compounds are present in a.colloidal. form preventing. their precipitation. This solution has theproperty of forming chromium lakes of the mordant colors which arecompletely soluble in the solution and which do not precipitate upon.

Specification of Letters Patent.

Patented Nov. 30, 1915.

Application filed March 24, 1914. Serial No. 826,944.

' dyestuffs their commercial value in the dyeing industry.

Successful dyeing of textile fibers with the mordant colors presentsmany dillicuhties and requires great care and the observance of cautionsin the application of the dyeing methods employed. The usual methods ofdyeing with these colors is to first mordant' the fiber with a chromiumcompound and then subject it to a solution of the dyestuff, or toreverse the operation and treat' the fiber first with the dyestulf andthen with the chromium mordant. This requires a number of steps in the'dyeing ope-ration and it is evident that unless the" fiber isthoroughly penetrated with each solution and the excess liquor carefullyre-- moved from the fiber after each step, the re sulting dyeings willbe unsatisfactory. It will thus be seen that on accountof theinsoluble-lake-forming properties of these colors, they are liable toaccumulate upon thp surface of the fiber, causing uneven dyeings,n0n-penetration, and results which crock and are not fast towashing,scouring and the other ordinary operations to which such goods aresubjected.

It is evident that if a perfectly clear solution of the chromiumcompound, or a perfectly clear solution ofthe chromium com- .pound andthe dyestulf can be formed and the textile fiber be thoroughly saturatedor penetrated with this solution and the insoluble lake be producedwithin the fiber after its penetration by this solution, the resultingdyeings will be more uniform and more thoroughly incorporated throughoutthe fiber, and that they will not have a tendency to creek and will befaster to the various operations to which the goods are subjected. Wehave found that the solutions formed by our new method have theseproperties and hence possess great value for the dyeing of textilefibers. The following example represents one method of following ourinvention: dissolve .108 pounds of glucose in 216 pounds Waterandgradually add pounds neutral chromate of sodium with constantstirring-maintaining a temperature of 80 degrees to 90 degrees C. Heatuntil the presence of chromic acid cannot be detected by an acidulatedsolution as for instance upon a water-bath, there results a dry brittleproduct, which when dissolved in water possesses all of the propertiesdescribed herein for the solution before evaporation.

\Ve do not limit ourselves to the particular ingredients, thequantities, times or tempera tures mentioned. above, nor to theparticular order of the incorporation of the ingredients. all oi. whichmay be varied without going beyond the scope of our invention asdescribed and claimed.

lVhat is claimed, is:

1. The process of. treating; glucose and neutral chromium compoundscomprising beating them together in solution. thereby producing asolution of a chromium compound not necipitatable by allralis or mordantcolors.

2. The process of treating glucose and neutral chromates ofallnili-metals comprising beating: them together in solution. therebypiwalucinn a solution of a chromium compound not prccipitatable byalliali's or mordant colors and maporatingr tov dryness.

The process of treating glucose and neutral chromate or soda comprisingheating them together in solution, thereby produc ing a solution of achromium compound not 6. As a new article of manufacture. a.

chromium compound producible by treatinn glucose and a neutralchron'iatc of soda from the aqueous solution of which the producedchromium compound is not precipitatable by allialis or mordant colors.

7. A dry brittle product producible by adding av neutral chromate oi. analkalimetal to a solution of glucose, heatin and evaporating to dryness.from the acmcous solution of which the produced clirou'iium compound isnot prccipitatable by alltalis or mordant colors.

S. A. dry brittle product producible by adding neutral chromate of sodato a solo (ion oi glucose. liating' and evaporating to dryness. from theaqucmis solution of which the produced chromium compound is notprecipitatable l alkalis or inordant colors.

Signed at the borough of Brooklyn. in the county of Kings. city andState of New York, this 21st day of lrlarch. 1.91%.

v VILLIAM BECI'CERS.

ISAAC D HQYF U Witnesses -S. R. DAVID,

l. K01: FIEYE.

